23) Moles of C = 2x 4 = 8

24) The balanced equation is as follows:

SnO2 +2 H2 ---> Sn + 2 H2O

So, the correct option is A. 2.

25) The option A is balanced correctly.

26) Molar mass of Ca(NO3)2 = 40 + (14 +(3x16))2 = 164

So correct option is D. 164.

27)Greatest molar mass is of option C. Br2 (80x2 =160)

28) 1 mole of Cu need Fe= 1 mole

1 mole of Fe = 54 g

So correct option is D. 54g.

29)The correct option is A. 2,3,1,6.

30) 4 moles of NH3 completely reacts with O2 = 5moles

1 mole of NH3 completely reacts with O2 = 5/4

2 moles of NH3 completely reacts with O2 = (5/4) x 2 =2.5 moles

So correct option is C. 2.5 .

31) The mass of 1 mole of C-12 is 12.01 grams

So correct option is C. 12.01 grams

32) To convert Celsius into Kelvin scale, just subtract 273 from it.

So 473-273= 200 C

So correct option is C. 200

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